sighting in Q

[buckyne]

anybody know where I can get some basic ballistic info for sighting in my muzzleloader? I don't have a place to shoot that is really close to my house and would like to find some basinc ballistic info to get started. I know there are almost endless permutations on load/bullet/ sabot but surely there is some basic info out there to get a guy started. I use XTP 300 grain bullets with 2 777 pellets in my knight if that helps. I am trying to get sighted in for 100-150 yard shots but am usually restricted to 50 yards for my sighting in. Any help/suggestions would be appreciated.

 

[Furner]

The load data from hodgdon does not have XTP 300gr, but they do have PTX 300 gr, so take that for what it is worth.
Load data says 2 50gr equiv pellets give you 1641fps.

Using published BC of .250, and a sight in distance of 50 yards, you will impact 3 inches low at 100yds, 10.6 inches at 150yds, and 23.5 inches at 200yds.

 

[Underclocked]

If using a scope, with PointBlank and a BC of .200, velocity 1625, sight in 2.25" high at 50 and you should be within +3,-3.3 out to 150 yds.

Dead on at 125 yards.

 

[sabotloader]

Furner

You might consider this close... or at least a starting point

The .452/300 XTP has a BC of 180

The .430/300 XTP does better with .245

 

[Furner]

Furner

You might consider this close... or at least a starting point

The .452/300 XTP has a BC of 180

The .430/300 XTP does better with .245

That looks better. My math was just a rough estimate from data I had on hand. Couldnt find the factory data.

 

[Underclocked]

Nah, where did you get that velocity?

 

[sabotloader]

UC

UC that is what I get with a 110 grains of T7-2f. Just looked up a 100 grain loads and they run 1750

From the Knight with 130 I can get 1950 fps.

All I can do is read it off the chrono...

Now with BH - I can step that up... with 120 grains of BH runs 1975 to right at 2000..

I also just looked up some of Chuck's velocities...

Knight Disc Extreme .50 300gr Shockwave
2- 777 pellets(100gr equav.) 1657fps
90gr 777 fffg -1718fps
100gr 777 fffg-1800fps

OOPs! I overlooked the line that said he was using T7 pellets-which certainly makes a difference...

 

[sabotloader]

buckyne

I did not read - missed it - that you were shooting pellets. All of my information is with loose powder. Pellets are loaded down to match loose BP or Pyrodex...

Do you want a print out using the 1650 velocity?

 

[horsefly]

this will probally be a super stupid question but what does bc stand for?

 

[Furner]

Here is the load data from Hodgdon for 777.
http://www.hodgdon.com/PDF/muzzleloading_manual_2008.pdf?CHECKBOX_1=on

They do not list the XTP but I would guess that based on other 300gr bullets listed, your muzzle velocity is going to be very similar. From there, get the BC for whatever bullet you are shooing and use a ballistics calculator to get your drop for whatever distance you need.

That way you can sight in at 50 and have a good estimate of your impact at 100 or 150


EDIT: And I was wrong on the BC for the XTP. It is .200, not .250

 

[Underclocked]

For all intents and purposes, the BC (ballistic coefficient) of a bullet from a muzzleloader makes very little real world difference within 150 yards.

So I don't really care much about a bullet's BC.

 

[sabotloader]

buckyne

Not sure which one you might be using...

Hornady .452/300 XTP Mag

Item Number 45235
Weight 2.23 lbs
Ballistic Coefficient 0.200
Sectional Density 0.210

Hornady .452/300 XTP

Item Number 45230
Weight 2.30 lbs
Ballistic Coefficient 0.180
Sectional Density 0.210